If the potential energy between two molecules is given by U = A r 6 + B r 12 , then at equilibrium,…

If the potential energy between two molecules is given by U=Ar6+Br12, then at equilibrium, separation between molecules, and the potential energy are:
  1. B2A1/6,-A22B
  2. BA1/6,0
  3. 2BA1/6,A24B
  4. B2A16,A22B

Solution

U=Ar6+Br12

f=-dUdr

For equilibrium

f=0

so r=2BA16

Then, U=A24B

Asked in: JEE Main 2020 (06 Sep Shift 1)

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